期刊论文

Microstructure and Properties of Fe-based Layer with In-situ Ti(C,N) Strengthening Particles on 304 Stainless Steel by Laser Cladding

中文

热加工工艺

1001-3814

2016

45

8

165-168

10.14158/j.cnki.1001-3814.2016.08.044

国家自然科学基金项目（51201088）； 湖南省教育厅科学研究项目（12C0324）； 南华大学青年英才支持计划（2014-002）； 湖南省重点学科建设项目（[2011]76）；

本校为第一机构

采用CO_2激光熔覆工艺在304不锈钢表面制备含Ti(C,N)增强相的铁基熔覆层。利用光学显微镜、X射线衍射仪、扫描电镜、维氏显微硬度计和电化学工作站对熔覆层的组织和性能进行表征分析。结果表明:熔覆层呈典型的树枝晶形貌组织,与基体形成了良好的冶金结合。钛铁粉末与石墨、氮气在激光熔覆过程中发生了原位反应,生成了 Ti(C,N)增强相。熔覆层主要由γ-Fe、α-Fe、Ti(C_(0.3)N_(0.7))、Fe-N等物相组成。熔覆层的平均硬度值为450 HV0.2,是基体硬度(240 HV0.2)的近2倍。抗电化学腐蚀性能是304不锈钢基材的1.43倍。

Fe-based composite layer with Ti (C, N) strengthening particles was prepared on 304 stainless steel surface by CO_2 laser cladding technology. Microstructure and properties of the cladding layer were studied by optical microscopy, X-ray diffractometer, scan electron microscopy, micro-hardness tester and electrochemical workstation. The results show that the cladding layer is a typical dendritic structure and it is well bonded with the substrate. Ti (C, N) strengthening particles are formed by in-situ reaction of titanium iron powder with graphi...